Set contentSizeInPopup size with constraints. about stpopup HOT 3 CLOSED

- (void)loadContentView
{
    CGFloat width = [UIScreen mainScreen].bounds.size.width * 3 / 4;
    CGFloat height = 400;
    width = width > 300 ? width : 300;

    self.contentSizeInPopup = CGSizeMake(width, height);

    UIView *wrapperView = [UIView new]; // This is for wrappering the _contentView, to avoid constraints conflict on iOS 8.0 and 8.1

    _contentView = [UIView new];
    [wrapperView addSubview:_contentView];
    [_contentView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.size.mas_equalTo(CGSizeMake(width, height));
    }];

    [_contentView setNeedsLayout];
    [_contentView layoutIfNeeded];

    [self contentViewDidLoad];

    [_contentView setNeedsLayout];
    [_contentView layoutIfNeeded];

    UIView *bottomView = nil;
    for (UIView *subview in _contentView.subviews) {
        if (subview.frame.origin.y + subview.frame.size.height > bottomView.frame.origin.y + bottomView.frame.size.height) {
            bottomView = subview;
        }
    }

    if (bottomView.frame.origin.y + bottomView.frame.size.height < height) {
        [_contentView mas_updateConstraints:^(MASConstraintMaker *make) {
            make.size.mas_equalTo(CGSizeMake(width, bottomView.frame.origin.y + bottomView.frame.size.height));
        }];
        [_contentView setNeedsLayout];
        [_contentView layoutIfNeeded];
    }

    self.contentSizeInPopup = _contentView.bounds.size;

    [_contentView removeFromSuperview];
}

- (void)contentViewDidLoad
{
     // For subclass overriding
}

- (void)viewDidLoad
{
    [self loadContentView];

    [super viewDidLoad];

    [self.view addSubview:_contentView];
    [_contentView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.top.and.left.equalTo(_contentView.superview);
    }];
}